Pósfai's run, the plank myth, Hyrox: how well do you follow fitness news?

Six questions from this week's fitness news: a marathon start, abs myths, Hyrox and a vineyard run. Take a guess, then read the explanations!

1. How many kilometres did Gábor Pósfai run at the SPAR Budapest Marathon Festival?
2. What does a personal trainer compare holding a plank for minutes to?
3. Roughly how much weight do Hyrox competitors push or carry on the course, at most?
4. Which survey found that Hungarians' sport and physical activity has improved?
5. How many runners completed the 3.5 km vineyard run in Nadap?
6. What probably saved the life of the runner who collapsed at the Esztergom half marathon?